add more comment

2021-05-30 23:44:29 +07:00 · 2021-05-30 23:44:29 +07:00 · c2a0c1507b
parent 54c9150574
commit c2a0c1507b
1 changed files with 1 additions and 0 deletions
--- a/src/portable/raspberrypi/rp2040/rp2040_usb.c
+++ b/src/portable/raspberrypi/rp2040/rp2040_usb.c
@ -136,6 +136,7 @@ void _hw_endpoint_start_next_buffer(struct hw_endpoint *ep)
    // Special case with control status stage where PID is always DATA1
    if ( ep->transfer_size == 0 )
    {
+      // ZLP also toggle data
      ep->next_pid ^= 1u;
    }else
    {